【摘要】：電子回旋共振加熱(ECRH,Electron Cyclotron Resonance Heating)是一種極具吸引力的輔助加熱方式,作為未來國(guó)際熱核實(shí)驗(yàn)反應(yīng)實(shí)驗(yàn)堆(ITER,International Thermonuclear Experimental Reactor)改變等離子體溫度、密度及電流剖面,控制等離子體磁流體(MHD,Magnetohydrodynamics)不穩(wěn)定性的首選方案,ECRH的實(shí)驗(yàn)研究是磁約束受控聚變研究的國(guó)際前沿課題之一。致力于解決兆瓦級(jí)長(zhǎng)脈沖毫米波高效率傳輸?shù)腅CRH傳輸線技術(shù)的研究也日趨活躍,而高功率毫米波功率以及極化特性的實(shí)時(shí)測(cè)量技術(shù)是其中的研究熱點(diǎn),開展相關(guān)研究可為電子回旋系統(tǒng)高效率運(yùn)行以及微波注入模式的優(yōu)化控制提供必備技術(shù)手段。本文將以140GHz傳輸線關(guān)鍵器件研究為研究課題,重點(diǎn)研究基于小孔耦合的功率監(jiān)測(cè)彎頭設(shè)計(jì)以及基于矢量衍射理論的高功率極化器設(shè)計(jì),通過微波功率測(cè)量可以得到ECRH系統(tǒng)傳輸效率和微波源輸入功率等參數(shù),而為了控制微波的極化方向,需要對(duì)高功率極化器進(jìn)行研究。本文的主要研究?jī)?nèi)容分為三部分:1.對(duì)ECRH傳輸線系統(tǒng)進(jìn)行簡(jiǎn)要介紹,主要介紹傳輸線上換向波導(dǎo)彎頭、波紋波導(dǎo)等組成部分,對(duì)傳輸線損耗及高斯基模與11HE模的耦合效率進(jìn)行分析。2.對(duì)目前高功率毫米波功率測(cè)量的幾種方法的優(yōu)缺點(diǎn)進(jìn)行分析,提出定向耦合器-毫米波功率計(jì)方式。簡(jiǎn)要介紹小孔耦合理論,對(duì)應(yīng)用于140GHz ECRH傳輸線上的功率監(jiān)測(cè)彎頭進(jìn)行結(jié)構(gòu)設(shè)計(jì)和參數(shù)優(yōu)化,從理論分析和軟件模擬等方面進(jìn)行研究,最終確定雙孔耦合結(jié)構(gòu)的各個(gè)參數(shù),并對(duì)雙孔耦合結(jié)構(gòu)參數(shù)進(jìn)行容差分析和彎頭組裝討論。3.總結(jié)目前高功率極化器所采用的槽紋結(jié)構(gòu),提出采用余弦形槽紋結(jié)構(gòu)。結(jié)合矢量衍射理論,通過軟件編程對(duì)140GHz ECRH傳輸線上基于矢量衍射理論的高功率極化器進(jìn)行槽紋結(jié)構(gòu)設(shè)計(jì)和參數(shù)優(yōu)化,確定可改變微波極化形式的圓極化器與線極化器結(jié)構(gòu)參數(shù),并分析槽紋形狀畸變對(duì)極化器極化性能的影響,對(duì)槽紋結(jié)構(gòu)參數(shù)進(jìn)行容差分析和機(jī)械結(jié)構(gòu)設(shè)計(jì),最后對(duì)搭建微波極化參數(shù)低功率條件下的實(shí)驗(yàn)測(cè)量系統(tǒng)及波入射等離子體角度與極化特性之間的關(guān)系進(jìn)行研究討論。
[Abstract]:Electron cyclotron resonance heating (ECRH,Electron Cyclotron Resonance Heating) is an attractive auxiliary heating method used as a future international thermonuclear experimental reactor (ITER,International Thermonuclear Experimental Reactor) to change plasma temperature, density and current profile. The first choice for controlling the instability of plasma magnetofluid (MHD,Magnetohydrodynamics) is the experimental study of ECRH, which is one of the international frontiers in the study of controlled fusion with magnetic confinement. The research of ECRH transmission line is becoming more and more active, and the real-time measurement technology of high-power millimeter-wave power and polarization characteristics is one of the research hotspots, which is devoted to the high efficiency transmission of megawatt long pulse millimeter wave. The related research can provide the necessary technical means for the high efficiency operation of electron cyclotron system and the optimal control of microwave injection mode. This thesis will focus on the design of power monitoring elbows based on small hole coupling and the design of high power polarizer based on vector diffraction theory, which will focus on the research of key components of 140GHz transmission line. The transmission efficiency of the ECRH system and the input power of the microwave source can be obtained by measuring the microwave power. In order to control the polarization direction of the microwave, it is necessary to study the high power polarizer. The main research contents of this paper are divided into three parts: 1. This paper briefly introduces the ECRH transmission line system, mainly introduces the commutation waveguide elbows and corrugated waveguides on the transmission line, and analyzes the transmission line loss and the coupling efficiency between the Gaussian mode and the 11HE mode. 2. The advantages and disadvantages of several high power millimeter wave power measurement methods are analyzed and a directional coupler-millimeter wave power meter is proposed. The theory of small hole coupling is introduced briefly. The structure design and parameter optimization of power monitoring elbows applied to 140GHz ECRH transmission lines are carried out. The parameters of double hole coupling structures are finally determined from the aspects of theoretical analysis and software simulation. The tolerance analysis and elbow assembly of two-hole coupling structural parameters are carried out. 3. The grooved structure used in the high power polarizer is summarized, and the cosine groove structure is put forward. Combined with vector diffraction theory, the groove structure design and parameter optimization of high power polarizer based on vector diffraction theory on 140GHz ECRH transmission line are carried out by software programming, and the structural parameters of circular polarizer and linear polarizer which can change the polarization form of microwave are determined. The influence of groove shape distortion on polarization performance of polarizer is analyzed, and the tolerance analysis and mechanical structure design of groove structure parameters are carried out. Finally, the experimental measurement system with low power polarization parameters and the relationship between the angle of incident plasma and the polarization characteristics are studied and discussed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN811

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本文編號(hào)：2441935